1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/* Definitions for thread-local data handling. linuxthreads/IA-64 version.
Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _TLS_H
#define _TLS_H
#ifndef __ASSEMBLER__
# include <dl-sysdep.h>
# include <pt-machine.h>
# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
/* Type for the dtv. */
typedef union dtv
{
size_t counter;
struct
{
void *val;
bool is_static;
} pointer;
} dtv_t;
#else /* __ASSEMBLER__ */
# include <tcb-offsets.h>
#endif /* __ASSEMBLER__ */
#ifdef HAVE_TLS_SUPPORT
/* Signal that TLS support is available. */
# define USE_TLS 1
# ifndef __ASSEMBLER__
typedef struct
{
dtv_t *dtv;
void *private;
} tcbhead_t;
/* This is the size of the initial TCB. */
# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
/* Alignment requirements for the initial TCB. */
# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
/* This is the size of the TCB. */
# define TLS_TCB_SIZE sizeof (tcbhead_t)
/* This is the size we need before TCB.
If there is not any room for uintptr_t stack_guard and
uintptr_t pointer_guard in struct pthread's final padding,
we need to put struct pthread 16 byte slower. */
# define TLS_PRE_TCB_SIZE \
(sizeof (struct pthread) \
+ (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t) \
? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1) \
& ~(__alignof__ (struct pthread) - 1)) \
: 0))
/* Alignment requirements for the TCB. */
# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
/* The DTV is allocated at the TP; the TCB is placed elsewhere. */
# define TLS_DTV_AT_TP 1
/* Install the dtv pointer. The pointer passed is to the element with
index -1 which contain the length. */
# define INSTALL_DTV(tcbp, dtvp) \
((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(DTV) \
(((tcbhead_t *)__thread_self)->dtv = (DTV))
/* Return dtv of given thread descriptor. */
# define GET_DTV(tcbp) \
(((tcbhead_t *) (tcbp))->dtv)
#if defined NEED_DL_SYSINFO
# define INIT_SYSINFO \
(((tcbhead_t *) __thread_self)->private = (void *) GLRO(dl_sysinfo))
#else
# define INIT_SYSINFO 0
#endif
/* Code to initially initialize the thread pointer. This might need
special attention since 'errno' is not yet available and if the
operation can cause a failure 'errno' must not be touched. */
# define TLS_INIT_TP(tcbp, secondcall) \
(__thread_self = (__typeof (__thread_self)) (tcbp), INIT_SYSINFO, NULL)
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
(((tcbhead_t *)__thread_self)->dtv)
/* Return the thread descriptor for the current thread. */
# undef THREAD_SELF
# define THREAD_SELF \
((struct pthread *) ((char *) __thread_self - TLS_PRE_TCB_SIZE))
# undef INIT_THREAD_SELF
# define INIT_THREAD_SELF(descr, nr) \
(__thread_self = (struct _pthread_descr_struct *)(descr) + 1)
# define TLS_MULTIPLE_THREADS_IN_TCB 1
/* Set the stack guard field in TCB head. */
#define THREAD_SET_STACK_GUARD(value) \
(((uintptr_t *) __thread_self)[-1] = (value))
#define THREAD_COPY_STACK_GUARD(descr) \
(((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-1] \
= ((uintptr_t *) __thread_self)[-1])
/* Set the pointer guard field in TCB head. */
#define THREAD_GET_POINTER_GUARD() \
(((uintptr_t *) __thread_self)[-2])
#define THREAD_SET_POINTER_GUARD(value) \
(((uintptr_t *) __thread_self)[-2] = (value))
#define THREAD_COPY_POINTER_GUARD(descr) \
(((uintptr_t *) ((char *) (descr) + TLS_PRE_TCB_SIZE))[-2] \
= THREAD_GET_POINTER_GUARD ())
/* Get the thread descriptor definition. */
# include <linuxthreads/descr.h>
# endif
#else
# ifndef __ASSEMBLER__
typedef struct
{
void *tcb;
dtv_t *dtv;
void *self;
int multiple_threads;
} tcbhead_t;
/* Get the thread descriptor definition. */
# include <linuxthreads/descr.h>
# define NONTLS_INIT_TP \
do { \
static const tcbhead_t nontls_init_tp = { .multiple_threads = 0 }; \
__thread_self = (__typeof (__thread_self)) &nontls_init_tp; \
} while (0)
#endif
#endif /* USE_TLS */
#endif /* tls.h */
|
